Building-block mold



Dec. 4, 1928.

C. J. DEXTER BUILDING BLOCK mom) 2 Sheets-Sheet l Filed Sept. El. 1927 Dec. 4, 1928. 11,693,693

c. J. DEXTER v BUILDING BLOCK MOLD Filed Sept. 21, 1927 2 Sheets-Sheet 2 Elm-undo;

EQLDEXIEEI' GARIL J DEXTER, OF LA FAYETTE, INDIANA.

BUILDING-BLOCK MOLDl Application.-filed september 21", 1927. Srial I-Td. 220,988.

The present-invention is directedlto improvements in building block. molds.

The primary object: olithe invention. is to provide a device ofthis. character so constructed that blocks can be quickly formed and provided with mortar retaining grooves acrossboth sides, or one-side, and; acrossthe endsth-ereot.

Another objectofthe invention is to provide a mold of this nature sooonstructed that the groove formingribs can be=easily and.

quickly withdrawn from the block during the molding process, the constructionand mounting of the ribs in themold being such that the material, when poured into the mold and tamped will not-cause-the ribs to: sagior warp. I

With these and otherobjects in view, this invention resides in the novel features of-construction, formation and". arrangement of parts to be hereinafter .moreiully described, claimed and illustrated in the accompanying drawings, in which,

Figure 1 is a top plan view of the mold.

Figure 2 is a side elevation.

Figure 3 is a longitudinal sectional view through the mold.

Figure 4 is a transverse sectional view through the mold.

Figure 5 is a perspective view of the block formed by the mold.

In carrying out my invention a mold 1 is used and consists of front and rear sides 2 and 3, respectively, which have their inner faces provided with a plurality of vertically spaced grooves 4 which may vary in number, as desired. These sides have their lower edges resting upon a bottom or base plate 5 which has formed therein openings 6 in which the cores 7 are movable, said plate being sup ported in any approved manner. The cores, of course can be raised and lowered through any. suitable mechanism.

The cores, as will be of course understood, are for the purpose of providing the finished block with air spaces and to permit the electrical conductors to be easily led through a wall formed from the blocks.

A pallet 8 rests upon the bottom plate and is provided with openings 9 which coincide with the openings 6 toaccommodate the cores 7, as clearly shown in Figures 3 and 4.

Mounted between the sides 2 and 3 are end plates 10 havin transversely disposed vertically spacedri s 11 upon their front faces,

said plates-being mounted upon. the confronting faces ofthe heads 11. which are'slidableiuponc thezpallet 8 in order that the plates 10' may be movcd inwardly or outwardly when: desired. It. Will be obvious. that the ribs llavill form transverse grooves in the ends of the block: during the molding process.

Inworder to provide longitudinal grooves in the sides of theblocks ribs 12 are employed which. consist of bodies 13 shaped to conform to the shape of the grooves 4; and in. which theyare .slidablyengaged,said. bodies in this instance being shown provided with dove tailedheads 14, but it willbe of course understood that the shape of the heads may be varied, as desired.

The ribs are of such length extend bet-ween the +1 L ii.

that tney will plates 10 and heads: 11 and in; which they slide, said plat-cs and heads havingtheir side edges formed with openings 15 corresponding. in shape to said ribs.

In order that the ribs 12 may be simultaneously withdrawn a member 16 connects one of their ends, power for moving the member being derived from any suit-able source.

As shown in Figure 5, a finished block 17 is illustrated which is provided with longitudinal side grooves 18 which are formed by the ribs 12 and end grooves 19 formed by tile ribs 11, there being air spaces 20 formed by the cores 7.

In operation, the cement is poured into the mold in a semisolid state and at which time the ribs 12 extend fully through the plates 10. This material is stamped as it is poured into the mold and will have impressed in its side and ends grooves corresponding in shape to the ribs 11 and 12. Owing to the fact that the bodies 13 are seated in the grooves a of the sides, the ribs 12 will be eti'ecti e1 braced throughout their length in order to prevent sagging of the ribs during the tamping operation, and in this manner the grooves 18 will be smoothly finished and in true parallelism. This not only adds to the finish or" t 1e block, but will permit the ribs 12 to be withdrawn with comparative case. It may be added that after the cement or has been thoroughly tamped a metal plate may be placed upon the upper end of the mold and subjected to pressure to enhance the appearance of the front face of the block.

It will be apparent that blooms formed in this manner and with the grooves are so arranged that they may be laid and firmly bonded by cement or mortar which will flow into the various grooves as the Wall is being built.

After the block becomes substantially hard in the mold and the ribs 12 have been withdrawn from engagement with the sides thereof, the plates 10 are moved outwardly, Whereupon the front side 9 is swung open and the block can he readily removed from the mold upon the pallet S. It will be of course understood that the cores 7 are Withdrawn previous to removal of the block. The openings 20 not only produce air spaces but end into the bloclr for a considerable distance so that when the block is finished i e ends of the spaces will be relatively thin in order that openings can be easily formed therein to permit electrical conductors to be installed in the well formed from the blocks.

It may be deisred at times to provide longitudinal grooves in one side only of a block, and in which event the grooves upon one of the sides Will be filled with plain bodies, that is bodies Withoutheads similar to the heads 13.

Having thus described the invention, 1 claim:

1. A mold for forming building blocks, comprising a bottom plate, spaced sides resting upon said plate, end plates adj ustahlo tmvard. and away from each other between the sides, said sides having grooves formed therein, ribs includingbodies slidably fitted in the grooves and having heads projecting inwardly therefrom to provide mortar re ceiving grooves in the sides of a block.

2. A mold for forming building blocks, comprising a bottom plate, spaced sides mounted upon the plate and, having grooves termed in their confronting faces, end plates mounted between the sides, ribs movable through the end plates and incladi f bodies for slidably engaging the grooves, said bodies having heads thereon 'for forming correspondingly shaped grooves in a side of the block.

it mold for formin' building blocks comprising a bottom pe, sides mounted upon the bottom plate and having grooves formed in their confronting faces, end plates adji tably mounted between the sides, ribs slidahle in the end plates and having bodies for s-zlidably engaging said grooves, said bodies having heads carried thereby for forming correspoinlin ly shaped grooves in the sides of a block, said end plates having ribs for forming grooves in the ends of the blocks, and cores movable through the bottom plates for forming air spaces in the blocks.

In testimony whereof I affix my signature.

CARL J. DEXTER. [n s] 

